Continuous glass grinding and polishing machine



March 15, 1932. J GRlFFlN 1,849,980

CONTINUOUS GLASS GRINDING AND POLISHING MACHINE Filed March 14. 1931 2 Sheets$heet l March ,15, 1932. J. H. GRIFFIN 8 CONTINUOUS GLASS GRINDING AND POLISHING MACHINE 7 Filed March 14, 1931 2 Sheets-Sheet 2 Patented Mar. 15, 1932 UNITED STATES PATENT, OFFICE JAMES HARRIS GRIFFIN, OF ST. HELENS, ENGLAND, ASSIGNOB TO PILKINGTON BROTHERS LIMITED, OF LIVERPOOL, ENGLAND, A LIMITED LIABILITY COMPANY CONTINUOUS GLASS GRINDING AND POLISHING MACHINE Application filed March 14, 1931, Serial No. saassnana in Great Britain March 20, 1930. i

In continuous glass grinding and polishing machines it is necessary to provide means for preventing the glass from sliding crosswise of the tables on which it is carried beneath the grinding and polishing runners.

Experience has shown that the best results are attained by the use of wooden pegs which are inserted in the edges of the. tables with their upper ends about flush with the surface of the glass. These pegs are'depressed after the finished glass has been removed from the tables so that their ends are flush with or below the surface of the tables to enable the latter to be efliciently cleaned. j i

The pegs fit tightly in the holes provided for them in the tables, and,as these pegs, dur- 7 ing the normal working of the machines, are also surrounded by plaster of Paris, considerable force is required for eifectingtheir dego pression.

The principal object of the present invention is to provide means for mechanically and automatically depressing the pegs. H

A further object of the present invention is to provide means for automatically raising the depressed pegs.

In the accompanying drawings:-

Figure 1 is an end view of the peg-depressing apparatus, partly broken away, showing. 36 a portion of a glass table in section;

Figure 2 is a side elevation of the apparatus shown in Figure 1;

Figure 3 is a side view of the device for raising the pegs, and V j Figure 4 is a section thereof taken on the line 4'4 of Figure 3.

Referring to the drawings, 1 is one of the travelling tables on which the glass is laid, only the two side portions thereof being shown. Close to the edgesare holes 2, adapted to take wooden pegs 3 (Figure 2).

Extending across and at a suitable height above thetables is a shaft 4 carried on a framework 5. Two discs 6 can turn freely on the shaft 4, and are held laterally in position by collars 7 fixed to the shaft 4. The

discs 6 are provided on their periphery with pins 8, spaced so that they enter the holes 2 as the tables move, the discs thereby gearing with the tables and being turned by the tables. Referring to Figure 2, in which the arrow indicates the direction of movement of the tables, each pin 8, as it approaches a hole 2,

comes first into contact with the peg 3 upstanding in the hole and depresses it in the hole, by substantially vertical movement.

The shaft 4 is mounted in bushes 9 held eccentrically to the shaft 4 in blocks 10 fixed to the framework 5. The bushes '9 can be angularly adjusted in the blocks 10 by lever handles 11 and thereby the height of the discs 6 relatively t'o'the tables 1 can be adjusted. I

In the event of the holes 2 not being evenly spaced along the series of tables, as may occur if the distance between the last hole in one table and the first hole in the adjoining;

table is not equal to the pitch of the holes in any one table, the pitch lines of engagement between the discs 6 and the'tables are made equal to the length of each table and the pins 8 are then spaced to correspond with the spacing of the holes 2 in the tables Though it forms a simple construction, it

is not an essential feature of the invention that the discs 6 should be rotated byrthe engagement of the pins 8 in the holes 2. The pins 8 may be used solely to depress the pegs 3, and the discs may be rotated by engagement of projections or teeth thereon with projections or teeth formed, for instance, on the edges of the tables.

The above described means may be used in conjunction with devices for raising the pegs at an initial stage of the grinding operation, and one constructional form of such devices is illustrated byway of examplein Figures 3 and 4 of the drawings. According to the said constructional form,a hammer 12 is pivoted at 13 to a support 14 and is urged upwards by a spring 15. A roller 16! is mounted in a block 17 pivoted to the hammer 12 at 18. The block 17 is prevented from moving further to the left than the position shown, by a lug 19 on the hammer.

The roller 16 engages a series of cams 20 cast on the underside of the tables 1, with pitch equal to that of the peg holes 2.

As the tables move in the direction of the arrow, the cams 20 successively force the hammer downwards against the spring 15,

and, when the centre of the roller 16 is passed by the point of the respective cam 20, the block 17 is thrown to the right, until stopped by contact say with the next cam leaving the hammer 12 free to rise under the actionof the spring- 15 to strike the peg 3 then in its ath. p A roller 21 with flange 22 is pivoted at 23 to an arm 24 which is pivoted to any convenient fixed support' The flange 22 rides on the surface ofeach table 1, at each of its edges, while the body of the roller 21 is at a height above the table equal to that to which the pegs 3 should be raised. 7

The roller 21 is made massive so that, when it is struck by the peg 3 raised by the ham- 7 mer 12, the momentum of the hammer is transmitted through the peg to the roller, which is thrown upwards, leavingthe peg vstationary at its correct height.

A non-rotating body may be used 1n place of the roller 21, provided. that the portion oi. it above the pin holes be maintained at the height above the tablesto which the pegs 3 should-be raised. v By means of the roller 21. pegs of unequal length and pegs fitting in their holes with different degrees oftig'htness areraisedfto thecorrect height. o 1 J Having described my invention, I declare that what I claim and desire to secure by Letters Patent is 1. In continuous glass grinding and polishing apparatus the combination with travelling tables having holes in theiredges carrying pegs which are depressed in said holes after completion of the grinding and polish ing operation, of a disc-rotatable above the tables and pins carried by said disc adapted to engage and depress the pegs during the rotation of the disc in unison with of the tables. v i V r o 2. In continuous glass grindingand polishing apparatus thecombination with travel-lingtables having holes in their edges cari rying pegs which are depressed in said holes after completion of the grinding and polishlng operation, of a disc rotatable above the tables, and'pins carried by said disc adaptedto engage and depress the pegs and also adapted to engage the holes for eflec'ting the rotation of the disc through the travel of the tables. 3 a

3. In continuous-glass grinding and polish-' ing apparatus thecombination with travelthe travelrying pegs which are depressed in said holes after completion of the grinding and polishing operation, of a disc rotatable above the tables, pins carried by said disc adapted to engage and depress the pegs during the rotation of the disc, a. shaft carrying the disc, and eccentrically mounted bushes supporting the shaft and angularly just the height of the-shaft.

5. In continuous glass grinding and polishing apparatus, the combination with trav- 7 elling tables having holes in their edges carry- .1

ing pegs'which are raised and depressed in said holes before and after the grindingand polishing operation, of a hammer adapted to strike upwards each pegqalong one edge of the tables and devices carried by the movingtables adapted-to control the actuation of the hammer. i

6. In continuous glass grinding and p01 ishing apparatus' thecombination with travelling tables having holes in their edges carrying pegs which are raised and depressed insaid holesbefore and after the grinding and polishing operation, of a hammer adapted to strike upwards each peg' along one edge of the tables, devices carried by the moving tables adapted to control the actuation of the hammer, and a massive'body adapted to be struck by the upper ends of the pegswhen thesechavebeen raised to approximately the correct height. 1

7. In continuous glassgrinding "and polishing apparatus, the combination with travelling tables having holes in their edgescarrying pegs which are raised and depressed in said holes before and after the grinding and polishing operation, or a spring-loaded hammer pivotally carried on a fixed support beneath the tables, and cams carried by the.

tables adapted to depress the hammer and release'it for striking successive pegs upwards during the travel of the tables. v

8. In continuous glass grinding and polishing apparatus, the combination with travelling tables having holes in their edgescarrying pegs which are raised and depressed in saidholes before andafter the grinding and polishing operation, of a spring-loaded hammer pivotally carried on aofiXed support be neath the tables, cams carried by the tables adjustable to .ad- 

